[mew-int 3194] Problems to send attachment with Text/Plain(windows-1252)

I get an incoming text attachment in Text/Plain(windows-1252). I save
the attachment to a file x.txt.

I compose a new message and add an attachment region. Then I use "c"
to copy the file x.txt to the attachemnt. Then I change the charset
from Text/Plain(guess) to Text/Plain(windows-1252) by typing "C" and
change the encoding by typing "B". That seems to work so far.

The attachment region then looks like this:

------------------------------ attachments ------------------------------
      Multipart/Mixed                                                                   29/                       
     1  Text/Plain(guess)                                                                 *Cover.txt               
B    2  Text/Plain(windows-1252)                                                          x.txt     
     3                                                                                    .                        
--------0-1-2-3-4-5-6-7-8-9----------------------------------------------


When I then try to send the email, it will not be sent but I get the
message "nil".

I wonder why I can not send it as Text/Plain(windows-1252) when I can
send it as Text/Plain(guess) and why I don't get a decent error
message.

This is on emacs 23.4.1 and mew 6.5.

This does not happen often because most of the people I communicate
with are sensible enough not to use windows-1252, but when it does,
it's annoying.

Harald.